From ee3f0ff740c38f8886b1b460a11dd44bb2d894e6 Mon Sep 17 00:00:00 2001
From: Sigurd Meldgaard <sigurdm@google.com>
Date: Tue, 22 Aug 2023 10:21:28 +0200
Subject: [PATCH] Log missing compilation output (#3992)

---
 lib/src/dart.dart | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/lib/src/dart.dart b/lib/src/dart.dart
index 69873d46b..4e1c4d1b7 100644
--- a/lib/src/dart.dart
+++ b/lib/src/dart.dart
@@ -156,6 +156,16 @@ Future<void> precompile({
     );
     final result = await client.compile();
 
+    // Sanity check. We've had reports of the compilation failing to provide a
+    // result, perhaps due to low-memory conditions.
+    // This should make this slightly easier to recognize in error reports.
+    if (!fileExists(temporaryIncrementalDill)) {
+      log.error(
+        'Compilation did not produce any result. Expected file at `$temporaryIncrementalDill`',
+        result.dillOutput,
+      );
+    }
+
     final highlightedName = log.bold(name);
     if (result.errorCount == 0) {
       log.message('Built $highlightedName.');